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A291347 as a simple table

na(n)
13
29
315
417
519
629
731
845
955
1063
1173
12101
13135
14173
15217
16271
17439
18535
19729
20787
21933
221473
231651
246617
257805
2612461
2713253
2818627
2920243
3055271

[3,9,15,17,19,29,31,45,55,63,73,101,135,173,217,
 271,439,535,729,787,933,1473,1651,6617,7805,12461,
 13253,18627,20243,55271]